APPARATUS AND METHOD FOR ADAPTIVELY ADJUSTING BACKLIGHT
First Claim
1. An apparatus of adaptively adjusting backlight for use in a liquid crystal display, the apparatus comprising:
- an intensity-pair distribution device for receiving a plurality of image frames to correspondingly generate a plurality of intensity-pair distribution values of the image frames, wherein each of the image frames is composed of a plurality of pixel data;
a brightness compensation module, electrically coupled to the intensity-pair distribution device, for computing a dark-state ratio of the pixel data in a current image frame in response to the intensity-pair distribution values of the current image frame, and for computing a brightness index of the current image frame in response to the dark-state ratio for generating a brightness compensating signal based on the dark-state ratio and the brightness index of the current image frame;
a frame-adjusting device, electrically coupled to the brightness compensation module, for adjusting the brightness of the pixel data of the current image frame in response to the brightness compensating signal;
a backlight control device, electrically coupled to the intensity-pair distribution device and the brightness compensation module, for updating the brightness index of the current image frame in response to the brightness index of a previous image frame and the intensity-pair distribution values of the current image frame for generating a backlight control signal of the current image frame; and
a backlight module, electrically coupled to the backlight control device, for adjusting the backlight luminance of the backlight module in response to the backlight control signal from the backlight control device for adaptively matching the brightness of the current image frame with the luminance profile of the backlight module.
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Abstract
An apparatus and method for adaptively adjusting backlight are described. The backlight adjusting apparatus includes an intensity-pair distribution device, a brightness compensation module, a frame-adjusting device, a backlight control device, and a backlight module. The intensity-pair distribution device generates a plurality of intensity-pair distribution values of the image frames each composed of a plurality of pixel data. The brightness compensation module computes a dark-state ratio of the pixel data of a current image frame in response to the intensity-pair distribution values, and computes a brightness index of the current image frame in response to the dark-state ratio for generating a brightness compensating signal based on the dark-state ratio and the brightness index. The frame adjusting device adjusts the brightness of the total pixel data of the current image frame in response to brightness compensating signal. The backlight control device updates the brightness index of the current image frame in response to the brightness index of a previous image frame and the intensity-pair distribution values of the current image frame for generating a backlight control signal of the current image frame. The backlight module adjusts the backlight of the module in response to the backlight control signal.
52 Citations
22 Claims
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1. An apparatus of adaptively adjusting backlight for use in a liquid crystal display, the apparatus comprising:
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an intensity-pair distribution device for receiving a plurality of image frames to correspondingly generate a plurality of intensity-pair distribution values of the image frames, wherein each of the image frames is composed of a plurality of pixel data; a brightness compensation module, electrically coupled to the intensity-pair distribution device, for computing a dark-state ratio of the pixel data in a current image frame in response to the intensity-pair distribution values of the current image frame, and for computing a brightness index of the current image frame in response to the dark-state ratio for generating a brightness compensating signal based on the dark-state ratio and the brightness index of the current image frame; a frame-adjusting device, electrically coupled to the brightness compensation module, for adjusting the brightness of the pixel data of the current image frame in response to the brightness compensating signal; a backlight control device, electrically coupled to the intensity-pair distribution device and the brightness compensation module, for updating the brightness index of the current image frame in response to the brightness index of a previous image frame and the intensity-pair distribution values of the current image frame for generating a backlight control signal of the current image frame; and a backlight module, electrically coupled to the backlight control device, for adjusting the backlight luminance of the backlight module in response to the backlight control signal from the backlight control device for adaptively matching the brightness of the current image frame with the luminance profile of the backlight module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of adaptively adjusting a backlight for use in a liquid crystal display, the method comprising:
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receiving a plurality of image frames; generating a plurality of intensity-pair distribution values of the image frames each, wherein each of the image frames is composed of a plurality of pixel data; computing a dark-state ratio of the pixel data in a current image frame in response to the intensity-pair distribution values of the current image frame, and computing a brightness index of the current image frame according to the dark-state ratio for generating a brightness compensating signal based on the dark-state ratio and the brightness index of the current image frame; adjusting the brightness of the pixel data of the current image frame according to the brightness compensating signal; updating the brightness index of the current image frame according to the brightness index of a previous image frame and the intensity-pair distribution values of the current image frame for generating a backlight control signal of the current image frame; and adjusting the backlight luminance of the backlight module in response to the backlight control signal from the backlight control device for adaptively matching the brightness of the current image frame with the luminance profile of the backlight module. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification